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Hey guys, I am new to the forum so sorry if this has already been talked about elsewhere. Some background info...I recently bought a 1998 m3 w/123k. Within a few weeks of owning it the expansion tank released all the anti-freeze (steamed out). So I took it in and had to get a new expansion tank and all the hoses etc.. I had no choice to do it myself since Its my daily driver. I was charged $470 for this parts and labor. While I had it in I expressed a concern I had had about the car not "firing up" great. sometimes I would have to stomp on the pedal to start it up, does not always fire up right away like it should. Without even checking he said I need a fuel pump assembly and pressure regulator and he could do it for $660. I said no thanks because I was not very happy with him and Id rather order the parts myself IF thats the problem. I also had a brake light switch installed for a check control error of brake light circuit. Long story short he says he checked the fuel pump and it isnt holding pressure. A few weeks later (tonight), the car would not start. lights windows radio air all work but it would not crank over at all. it makes a hissing sound sounds like its coming out of the stereo or control module. I googled it and it sounds like maybe I have a blown fuse, ignition or bad starter, or maybe it is infact the fuel pump assembly? After googling I tried to start it again and it caught, I drove it around briefly and all seemed fine...anyone have some insight.

Also a few weeks ago I had the spining key problem..I am just not sold on wheter or not it is a bad fuel pump or something wrong with the starter or even just a fuse. How do I check, etc..

Could any of the recent work have caused some sort of no start situation. ( expansion tank and all hoses, brake light switch installed). I feel like maybe something happened when they put the brake light in. I have read about similar things happening causes fuses to short electrical problems and also something to do with the security system not allowing the car to crank.. Please guys I need some help I cant really afford to spend another 660 and be S.O.L if it doesnt fix the problem

OK thanks will do. Ok well how do I check the fuses (mine are not the see thru kinds). it has been starting up with some help from my foot on the pedal but I am thinking that my fuel pump may be going bad and I need to replace it. But i would also not be uprised if the issue was electrical because the car acts up sometimes